A Miniatured WLAN/Wi-MAX Chip Antenna for Mobile Phone Applications

A compact WLAN/Wi-MAX chip antenna for mobile phone applications is presented in this paper. Two chip antenna designs are proposed. One is for WLAN (2.4 similar to 2.48, 5.15 similar to 5.35, 5.725 similar to 5.85 GHz) and Wi-MAX (3.4 similar to 3.7 GHz). Its dimensions are 3mm x 9 mm x 1.6 mm. The other is for WLAN (2.4 similar to 2.48, 5.15 similar to 5.35, 5.725 similar to 5.85 GHz)/Wi-MAX (2.5 similar to 2.7 GHz). The dimensions are 3mm x 11 mm x 1.6 mm. The antenna configuration of the two designs comprises two resonant branches. Not only the fundamental mode but also the second order resonance are utilized. Furthermore, the meander line structure is used to create two adjacent resonant frequencies to achieve a tri-band operation. Measurements of the return loss and antenna patterns were performed. The measured result shows good agreement with simulated ones. The main advantage of the proposed chip antenna is that it doesn't require a guard region from other circuit components and is therefore attractive to mobile devices.